不定项选择下列说法正确的是a.只有受迫振动才能�生共振现象 b.一切振动都能�生共振现象 c.只要振动受到阻力它一定做阻尼振动 d.若振动 Template




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tomski不定项选择下列说法正确的是a.只有受迫振动才能�生共振现象 b.一切振动都能�生共振现象 c.只要振动受到阻力它一定做阻尼振动 coloring